Hi Iāve had GSPās for a while now and we have 4 small (3-5cm) in a 300 litre tank. Now we have always had 1 that constantly had a dark belly while the others have a very white belly and bright colours. We have tested everything in the water which is all perfect. We have a spoke to a fish shop that recommends getting a couple more as it may be just pushed out of the group and is stressed because itās lonely. Which we have noticed he is always trying to stay clear of the other 3. I will attach a photo to show the GSP and one that is perfectly fine but seeking advice on anyone that has any other advice!
Thankyou
Thankyou